Well, for me, and many millions of people like me, it would be harder. Since all my music is in iTunes already, all I need to do to get music on my iPhone is press the sync button. That's it.

But if it was drag n drop, windows based, I'd need to first plug the phone in, then click off that annoying crap pop up that always comes up asking what I'd like to do, then I'd need to open my music folder, navigate to each individual artists > album > song, collate all those mp3 files, then drag them all over to the phone icon and drop them there (or into an open window for the phone)

Hmm, all that - or just press sync (without even plugging it in). Hmm......